An electrically neutral atom of manganese has an atomic number of 25. how many electrons does this atom have?

Calcium hydride (CaH2) reacts with water to form hydrogen gas: CaH2 (s) + 2H2O (l) → Ca (OH) 2 (aq) + 2H2 (g) How many grams of CaH2 are needed to generate 45.0 L of H2 gas at a pressure of 0.995 atm and a temperature of 32 °C?

A 100-g piece of metal initially at T = 75C is submerged in 100 g of water initially at T = 25C. The specific heat capacity of iron is 0.45 J g-1 °C-1 and the specific heat capacity of water is 4.18 J g-1 °C-1.

The normal temperature range of the liquid phase of pure water is 0 degrees Celsius to 100 degrees Celsius. Which of the following aqueous solutions has the largest liquid phase range? a. 0.1M C2H5OH b. 0.1 M KBr c. 0.2 M MgBr2 d. 0.2 M MgSO4

How many subatomic particles would a neutal atom have if its atomic number was 23 and its mass number was 57?

What is the total number of protons contained in the nucleus of a carbon 14 atom

How do you describe an Ionic Bond?

Calculate molality of a 2m aq solution of sodium chloride with density 1.35g/mol

One important factor in any chemical synthesis is the actual quantity of desired product obtained compared to the theoretical amount predicted on the basis of the stoichiometry of the reaction.

In the old west, a cowboy would put their ear on the railroad track to determine if a train was coming. Using this method, they could tell if the train was coming sooner than just listening for the train.

Is lead a mixture or pure substance? and is Paint a mixture or pure substance?